Range-boiler



(No Model.)

V. WILHELMI. RANGE BOILER.

No. 495,236. Patented Apr. 11', 1893 INVENTOH ATTORNEYS.

UNITED STATES PATENT OFFICE.

VALENTIN WILHELMI, OF PATERSON, NEW JERSEY.

RANGE-BOILER.

SPECIFICATION forming part of Letters Patent No. 495,236, dated April11, 1893.

Application filed January 12 1893. Serial No. 458,104. (No model.)

To all whom it may concern.-

Be it known that I, VALENTIN WILHELMI, a citizen of the United States,residing at Paterson, in the county of Passaic and State of New Jersey,have invented certain new and useful Improvements in Range Boilers, ofwhich the following is a specification.

This invention relates to improvements in that kind of boilers that areconnected with the water-backs of ranges and cooking stoves; and theobject of my invention is to provide a boiler of this kind which isreinforced and strengthened at the heads.

The invention consists in a range boiler composed of a cylindricalsheet-metal shell and sheet-metal heads, said boiler being provided withannular sheet-metal bands that are spun over part of the heads and partsof the ends of the shell and over the doubled and folded edges of saidshell and heads.

In the accompanying drawing a vertical transverse view of myimprovedrange boiler is shown.

The boiler consists of the cylindrical shell or body A, the cup-shapedtop-head B and the cup-shaped bottom-head O, which shell and heads arepreferably made of copper but may be made of any other sheet-metal. theends of the shell A the reinforcing rings E and F are placed, and overthe outer surface of said rings the end-parts of the shell and parts ofthe heads are spun and also on said outer surface of the reinforcingrings the edges of the shell and the heads are interlocked and doubledover to form a close and tight joint,

- which folded joint forms a flattened head on the outside of the boilerat each end, as shown at a, and at each side of said flattened bead anannular shoulder b is formed at the top and bottom of each reinforcingring F. Boilers such as have been now described are old and well known.

For the purpose of reinforcing the boiler and more rigidly andpermanently connecting the heads with the end-parts of the shell anannular band or ring H of sheet-metal is spun around the boiler at eachend, so as to cover the doubled and folded parts of the sheet-metalforming the flattened bead a and also the shoulders I), whichsheet-metal rings H are spun down in close contact with said flattenedbeads and shoulders, so that each ring when spun in place will have thecentral raised part d and the shoulders f. As said raised parts (1 andshoulders f engage and interlock with the flattened bead a and theshoulders 19 of the boiler, they prevent all displacement of the headsin relation to the ends of the shell and compel all the parts of theboiler to contract and expand uniformly. These spun bands do not relyupon hard or soft solder for holding them and firmly holding the partstogether, but depend entirely upon their shape, as they are spun overthe parts of the boiler in such a manner as to fully adapt themselves tothe shapes of those parts as close as possible. The foot J has its upperpart placed against the lower part of the lower band or ring H and itslower edges turned inward to form a flange J to rest upon the boilerstand.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent 1Q In a range boiler, the combination with acylindrical shell, of top and bottom heads, the edges of the shell andheads being doubled over and folded to form aclose joint, and ofsheet-metal rings placed over said doubled and folded joints and spun inclose contact.

with said joints, substantially as set forth.

2. In a range boiler, the combination with a cylindrical shell, of topand bottom heads, the edges of theheads and shell being doubled over andflattened to form a tight joint, and a sheet-metal ring spun over eachend of the boiler at the joint, so as to overlap part of the shell andpart of each head, each ring having a raised central portion and a shoulder at each side of the raised central portion, substantially as setforth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

VALENTIN WILl-IELMI.

Witnesses:

OSCAR F. GUNz, CHARLES SOHROEDER.

